Organic-inorganic polymeric water-retaining fertilizer and preparation method of the same

Abstract

Provided is an organic-inorganic polymeric water-retaining fertilizer, which is a co-polymer made by fusion and co-polymerization of an organic water-retaining monomer and an inorganic nutrient under action of a catalyst, a biological enzyme and a modifying agent. The co-polymer is of a three-dimensional mesh-like hydrophilic group structure. In a method for preparing the organic-inorganic polymeric water-retaining fertilizer, after obtaining a neutralized pre-polymer from the organic monomer with the catalyst, an initiator and a cross-linking agent are added; the inorganic nutrient and a metasilicate are added simultaneously, a solution is formed by stirring sufficiently; the biological enzyme is added for catalysis; a co-polymer is obtained after fusion and co-polymerization; and granulation and drying are carried out. Preferably, the catalyst is an inorganic alkaline solution. Preferably, the catalyst is selected from the group consisting of a sodium hydroxide solution, a potassium hydroxide solution, an ammonia water and a calcium hydroxide solution.

The invention claimed is: 
     
       1. An organic-inorganic polymeric water-retaining fertilizer, wherein said organic-inorganic polymeric water-retaining fertilizer is a co-polymer, said co-polymer is made by fusion and co-polymerization of an organic water-retaining monomer, an inorganic nutrient, a biological enzyme and a modifying agent under action of a catalyst, a cross-linking agent and an initiator, and said co-polymer is of a three-dimensional mesh-like hydrophilic group structure, said organic-inorganic polymeric water-retaining fertilizer, weighed in parts by weight, comprises: 400-600 parts of acrylic acid, 8900-9600 parts of inorganic nutrient, 50-100 parts of modifying agent and 5-15 parts of biological enzyme. 
     
     
       2. The organic-inorganic polymeric water-retaining fertilizer according to  claim 1 , wherein said organic-inorganic polymeric water-retaining fertilizer is made by fusion and co-polymerization of the organic water-retaining monomer, the biological enzyme and the inorganic nutrient; and said monomer comprises one selected from the group consisting of an acrylic acid and a derivative of the same. 
     
     
       3. The organic-inorganic polymeric water-retaining fertilizer according to  claim 1 , wherein said inorganic nutrient comprises one or more selected from the group consisting of calcium magnesium nitrate, urea, monoammonium phosphate, potassium salt, calcium nitrate, magnesium sulfate, zinc sulfate, sodium silicate and sodium borate; and said potassium salt comprises one selected from the group consisting of a potassium sulfate and a potassium chloride. 
     
     
       4. The organic-inorganic polymeric water-retaining fertilizer according to  claim 1 , wherein said biological enzyme comprises one or more selected from the group consisting of protease, cellulase, lipase, pectinase and an enzyme from enzyme microorganisms. 
     
     
       5. The organic-inorganic polymeric water-retaining fertilizer according to  claim 1 , wherein said modifying agent comprises two or more selected from the group consisting of protein powder, cellulase powder, pectin, lipid, starch, fish meal and bone meal. 
     
     
       6. The organic-inorganic polymeric water-retaining fertilizer according to  claim 1 , wherein said inorganic nutrient comprises the following components in parts by weight:
 1700-1800 parts of urea, 
 1500-1600 parts of monoammonium phosphate, 
 3500-3600 parts of potassium sulfate, 
 1000-1100 parts of calcium nitrate, 
 1000-1100 parts of magnesium sulfate, 
 150-250 parts of sodium silicate, 
 30-80 parts of zinc sulfate, and 
 30-80 parts of sodium borate. 
 
     
     
       7. The organic-inorganic polymeric water-retaining fertilizer according to  claim 1 , wherein said fertilizer has a pH of 3-8, a mass fraction of organic matter of more than 20%, a water absorbency of 10 g/g-20 g/g; the total content of nitrogen, phosphorous and potassium is 35%-40%; the total content of calcium, magnesium, silicon and sulfur is greater than 5%. 
     
     
       8. A method for preparing the organic-inorganic polymeric water-retaining fertilizer according to  claim 1 , wherein after obtaining a neutralized pre-polymer from the organic water-retaining monomer under the action of the catalyst, the inorganic nutrient is added; then an initiator and a cross-linking agent are added, a solution is formed by stirring sufficiently; the modifying agent and the biological enzyme are added; a co-polymer is obtained after fusion and co-polymerization; and granulation and drying are carried out; said catalyst is an inorganic alkaline solution. 
     
     
       9. The method according to  claim 8 , wherein said method comprises steps of:
 1) mixing an acrylic acid and the catalyst, which react for 15-20 minutes to obtain the neutralized pre-polymer; 
 2) sequentially adding the inorganic nutrients, the cross-linking agent and the initiator into the neutralized pre-polymer, which react for 15-25 minutes under a temperature controlled at 65° C.-70° C.; and lowering the temperature to 35° C.-55° C.; 
 3) stirring the mixture obtained in step 2) to form a solution; adding into the solution the modifying agent and the biological enzyme, which are stirred for 10-20 minutes to obtain the co-polymer; and 
 4) making said co-polymer into granules by drying, grinding and sieving. 
 
     
     
       10. A method for preparing the organic-inorganic polymeric water-retaining fertilizer according to  claim 2 , wherein after obtaining a neutralized pre-polymer from the organic water-retaining monomer under the action of the catalyst, the inorganic nutrient is added; then an initiator and a cross-linking agent are added, a solution is formed by stirring sufficiently; the modifying agent and the biological enzyme are added; a co-polymer is obtained after fusion and co-polymerization; and granulation and drying are carried out; said catalyst is an inorganic alkaline solution. 
     
     
       11. A method for preparing the organic-inorganic polymeric water-retaining fertilizer according to  claim 3 , wherein after obtaining a neutralized pre-polymer from the organic water-retaining monomer under the action of the catalyst, the inorganic nutrient is added; then an initiator and a cross-linking agent are added, a solution is formed by stirring sufficiently; the modifying agent and the biological enzyme are added; a co-polymer is obtained after fusion and co-polymerization; and granulation and drying are carried out; said catalyst is an inorganic alkaline solution. 
     
     
       12. A method for preparing the organic-inorganic polymeric water-retaining fertilizer according to  claim 4 , wherein after obtaining a neutralized pre-polymer from the organic water-retaining monomer under the action of the catalyst, the inorganic nutrient is added; then an initiator and a cross-linking agent are added, a solution is formed by stirring sufficiently; the modifying agent and the biological enzyme are added; a co-polymer is obtained after fusion and co-polymerization; and granulation and drying are carried out; said catalyst is an inorganic alkaline solution. 
     
     
       13. A method for preparing the organic-inorganic polymeric water-retaining fertilizer according to  claim 5 , wherein after obtaining a neutralized pre-polymer from the organic water-retaining monomer under the action of the catalyst, the inorganic nutrient is added; then an initiator and a cross-linking agent are added, a solution is formed by stirring sufficiently; the modifying agent and the biological enzyme are added; a co-polymer is obtained after fusion and co-polymerization; and granulation and drying are carried out; said catalyst is an inorganic alkaline solution. 
     
     
       14. A method for preparing the organic-inorganic polymeric water-retaining fertilizer according to  claim 6 , wherein after obtaining a neutralized pre-polymer from the organic water-retaining monomer under the action of the catalyst, the inorganic nutrient is added; then an initiator and a cross-linking agent are added, a solution is formed by stirring sufficiently; the modifying agent and the biological enzyme are added; a co-polymer is obtained after fusion and co-polymerization; and granulation and drying are carried out; said catalyst is an inorganic alkaline solution. 
     
     
       15. A method for preparing the organic-inorganic polymeric water-retaining fertilizer according to  claim 7 , wherein after obtaining a neutralized pre-polymer from the organic water-retaining monomer under the action of the catalyst, the inorganic nutrient is added; then an initiator and a cross-linking agent are added, a solution is formed by stirring sufficiently; the modifying agent and the biological enzyme are added; a co-polymer is obtained after fusion and co-polymerization; and granulation and drying are carried out; said catalyst is an inorganic alkaline solution.